答案 答案: (1)286;(2)79;(3)1339;(4)30 分析: (1)301−(5÷5+14) =301−(1+14) =301−15 =286 (2)(380+570÷38)÷5 =(380+15)÷5 =395÷5 =79 (3)(58+45)×(58−45) =103×13 =1339 (4)15×[(517−321)÷98] =15×[196÷98] ...